Why does Huntington's disease have a heritability ratio of 1.0?
A) The gene that causes Huntington's disease is dominant.
B) In families where Huntington's disease is prevalent, it tends to appear at least once every generation.
C) If someone inherits the gene for Huntington's disease, it is inevitable that he/she will acquire the disease.
D) Because of environmental influences, it is difficult to predict whether someone will acquire the disease despite having the diseased allele.

Question

Quizplus · Accepted Answer

Huntington's disease has a heritability ratio of 1.0 because it is a genetic disorder caused by a specific dominant gene mutation. If an individual inherits this gene, they will inevitably develop the disease, indicating that the trait is entirely determined by genetics with no environmental influence.

Why Does Huntington's Disease Have a Heritability Ratio of 1